Compressor construction for refrigerating devices



May 1% 1929 R, M. \HVID CUMIRESSOR CONSTRUCTION FOR REFRIGERATHW:DEVIWZfi Filed Oct. 25, 1927 ja cu/0 7',

Patented May 14, 1929.

UNITED STATES.

RASMUIS M. HV'ID, OF CHICAGO, ILLINOIS.

COMPRESSOR CONSTRUCTION FOR REFRIGEBATIN G DEVICES.

. Application filed. October 25, 1927. Serial No. 228,512.

My invention relates to refrigerating devices, and particularly to adetail of construction of the machine illustrated in 'my copendingapplication, Serial No. 228,510

a filed of even date herewith.

An object of the invention here disclosed isv to provide for simple andeconomical mounting and assembly of the compressors. In the device of my"invention, I have found to it desirable to mount the compressor motordirectly above the pressure chamber and to drive the compressors withoutspeed reducing means between them and the motor. This results inrelatively very high speed of the' compressors with consequent necessityfor accurate work in construction and assembly. In order to avoid muchof the accurate fitting that would ordinarily be required, I haveadopted means that insure 2o certainty of operation for an. indefiniteperiod without likelihood of wear or disarrangement.

To this end, I provide a pair of compressors radially arranged relativeto the drive shaft, the cylinders of the compressors being mounted foroscillation about a large bearing stud, suitable spring means beinginterposed to tween the adjacent walls which contain the so inlet andexhaust ports and incidentally to take up any possible wear.

The invention also contemplates another improvement intended to functiononly while the parts are being assembled. The oil pump as is employedfor elevating the oil from the bottom of the high pressure chamber ahigher point in the chamber, and to facilitate the engagement of themotor crank with the oil pump mechanism. I provide a spring to backedcrank pin, so arranged that the parts may be assembled without regard tothe position of the parts that will ultimately cooperate, with theassurance that n the first stages of operation, the crank pin Wlll asatsame its proper posltion.

The invention will be more readily understood by reference to theaccompanying drawing, in which the figure is a vertical sectional viewthrough a machine construct- 5o ed in accordance with my invention.

The main casing on the high side of the machine consists of upper, lowerand intermediate castings, 10, 11 and 12. The intermediate casting orwall which serves to divide the chamber into two compartments servesalso as a support for compressor cylinsure a tight bearing beinders, 13,14, radially arranged and cooperating with pistons, 15, 16 operativelyconnected to a crank 17 on a driven shaft, 18. The cylinders areprovided with the customary ports and with a sprin seated cylmderhead 19which acts as a dlscharge valve.

The cylinders are provided withvertically extending laterally projectinghollow, stud shafts or hubs, 2Q, snugly fitting within the bosses 21formed in the wall 12. A cup shaped member having the cylindricalportion 22 and an annular flange 23 is fitted within the recess withinthe shaft, the annular portion bearing on the top end of the hub, 21. Abolt 24. extends downwardly within the recesses and through the cupmember and is threaded in the metal of the cylinder. A compressionspring 25 bears against the bottom of the cup member and against thehead of the bolt, 24, and thereby tends to pull the cylinder against thebottom face of the wall 12. The construction has the advantage that noone of the parts other than the bearing surfaces between the shaft andthe hub have relative movement. The oscillation of the shaft servesmerely to slightly twist the spring; therefore the washer does not turn.

At the end of the crank, 17 I provide a counter wei ht 26 which is heldin place by means 0 a screw having a slotted head 27. A pin 28 extendsthrough the head and upward within the body. of the screw and.

is backed by a compression sprin 29 which tends to thrust the indownward y. An oil pump 30 is locate on the bottom wall of the casing,11, the driven element of the pump including a disc, 31 having anaperture, 32 therein near its periphery. Theposition of the disc and itsaperture relative to the pin 28 is such that regardless of the manner ofassembly of the parts, the pin will engage with the aperture" 32 duringthe first rotation of the crank. In other words, the parts may beassembled without care as to engagement of the pin with the oil pump,

with the assurance that as soon as the motor,

is started, engagement will take place. This is a useful and essentialfeature, inasmuch as the parts are entirely concealed ,and can not beseen during assembly.

Numerous modifications and changes may be made in the constructionshown, and I do not wish to be limited except as indicated in theappended claims.

stud shaft having a recess to receive said washer, a spring bearing onsaid washer and a bolt mounted concentrically within the hollow shaftand engaging the opposite end of said spring.

2. In a device of the class described, the combination of a wallproviding a relatively long bearing opening, a compressor cylinderhaving a long, relatively large, hollow stud shaft extending laterallyrelative to the length of the cylinders, a dished washer, the flanges ofwhich rest on the wall and the dished portion of which projects into thehollow shaft, a bolt concentrically mounted in the hollow shaft, and aspring surrounding said bolt and engaging the dished washer at one endand the head of the bolt at the opposite end.

3. In a compressor construction, the combination of a horizontal wallhaving an opening, an oscillating cylinder having a hollow stud shaftprojecting into said opening, a bolt and compression springconcentrically mounted in the hollow shaft, means for transmitting thethrust of the spring in one direction against said wall, the thrust inthe opposite direction tending to hold said cylinder against said wall.

4. In a compressor construction, the combination of a high pressurechamber, a compressor/and an oil pump in said chamber, a drive shafthaving a crank, said oil pump having an apertured disc concentric withsaid drive shaft, and a spring pressed plunger carried by said crank andadapted to register with the aperture in said disc.-

In testimony whereof I have aflixed my signature.

RASMUS M. HVID.

